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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7e5e5f52e8de0a386b414acfe630c3dcf4979e611118f0ed1fb8453a4023f51' 
  AND token = 'F7erVfguY2jg+4fqY/dM3bLXBeY21Tynh78QSIYZuZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}